Manually centered line boring machine



Sept. 8, 1953 E. A. FOSTER 2,651,221 MANUALLY CENTERED LINE BORINGMACHINE Filed Nov. 16, 1948 2 Sheets-Sheet l INVENTOR.

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MANUALLY CENTERED LINE BORING MACHINE Filed Nov. 16, 1948 2 Sheets-Sheet2 ATTEI RN EYS Patented Sept. 8, 1953 um-mp srAri-zs PATENT OFFICE. I

I I r 2,651,221 MANUALLY CENTERED LINE BORING f MACHINE I Edward A.Foster, Burger, Tex. I Application November 16, 1948, Serial No. 60,3151 Claim. (01. 77-2) @My present invention relates to the general classof portable, ,manually operated boring machinesand more specifically toa manually centered line boring machine which, whilewell adapted forvarious purposesand uses,-is'-esp ecially designed for accuracyin boringthe spaced bearings of motors or engines. The primary purpose of theinvention is the provision or" a manually operated line boring machineof the portable type having means whereby'the boring bar may readily beadjusted in horizontal and vertical directions with a minimumexpenditure of time and labor, and then rigidly supported in adjustedposition for accurately boring the alined bearings.

The invention includes a minimum number of parts, some of which areinterchangeable, that may be manufactured with facility and low cost ofproduction, and the parts may be assembled with convenience, to providea reliable machine that may be installed for use with ease, and whichperforms its functions with precision.

The invention consists in certain novel features of construction andcombinations and arrangements of parts that are embodied in each of twoor more bridges, or bearing supports for the boring bar that make up thetool, and in their adjustment mechanisms as will hereafter be describedand more particularly set forth in the appended claim.

of the invention.

Figure 1 is a view in end elevation of one of the bridges showing itsrelation to an engine block on which it is mounted; and Figure 2 is atop plan view of the structures in Fig. 1.

Figure 3 is an enlarged vertical sectional view at line 3-3 of Fig. 2.

Figure 7 is a, perspective view of one of the two hold down blocks, orattaching blocks for the bridge.

In Order that the general arrangement and for tie bolts that unite thelower and upper portions of the engine. .These bolt holes are utilizedin mounting and attaching two or more jof-the Each pair of arms isequipped with an interchangeable and adjustable hold down block, or

and threaded in the bolt holes of the flange F, the bridge may berigidly fastened in operative position.

The usual boring bar with its tools, is adjustably mounted in alinedsplit bearings of the trated at l0, and provided with a clamping bolt ll for mounting on the boring bar; and this reby means of a pair ofspaced clamp bolts l4, l4,

and clamping keys I5, l5, that are retained on the reduced or pin endsof the clamp bolts.

ends 20 are threaded, permanently, in diametrically arranged sockets ofthe bushing 13. These bolts or screw bars, rigid with the bushing, aretransversely adjustable transversely of the engine block, and for thispurpose they are mounted between the spaced arched brackets, intransversely arranged spacing blocks 2 i and 22 that are rigidlyfastened to the arches I and 2 by bolts 23 and 24, the latter extendingthrough the blocks and the arches and provided with lock nuts 25.

For laterally adjusting the pilot post and centering the boring bar, twoopposed threaded bushings or hand-turned nuts 26 and 21 are threaded onthe outer ends 28 of the screw bars,

and each bolt or screw bar is rigidly clamped within its block inadjusted position by means of a clamp bolt or set bolt 29 threaded downthrough the block and provided with a reduced end or dowel pin 30 uponwhich a clamp key 31 is mounted for engagement with the threads of thescrew bar.

Thus by manipulating the nut 11 for vertical adjustment and the opposednuts 26 and 21 for horizontal or lateral adjustment, the pilot posts mayeasily be centered with the boring bar mounted therein, for precisearrangement of the boring tools on the boring bar; and the manuallyoperated boring bar performs its functions with efiiciency and facility.

Having thus fully described my invention, what I claim as Patent is:

-A portable cross bridge for supporting an adjustable tool comprisingtwo laterally spaced arched brackets, a pair of oppositely extendingarms on each bracket, a pair of screw bars mounted between the bracketin opposed relation to each other, a bushing threaded to the inner endsof the screw bars for supporting a pilot post, spacing blocks on thebrackets and rigidly fastened thereto through which said screw barspass, means on each screw bar for adjusting the position of the bushingwith relation to the brackets and means carried by said brackets forholding said screw bars in adjusted position.

EDWARD A. FOSTER.

References Cited in the file of this patent UNITED STATES PATEN'ISNumber Number

